No, we're not talking about Nate and Charlie ... though it looks like they'll be locking lips too. Gossip Girl fans know exactly what we're referring to. It's a kiss that's been weeks in the making.

Tonight on Gossip Girl, the Upper East Siders attend a performance of “Sleep No More,” a theater performance which translates to masks, anonymity and some surprising romantic twists.

Regarding whether Chuck and Blair kiss tonight, that's fairly obvious. But EW confirms: "Fact: It happens at Sleep No More. Fact: It’s probably not what you’re thinking."

The Canadian promo is pretty helpful in shedding some light on this ...

In addition, "Fact: There's definitely a scheme involved ... possibly multiple schemes. And there’s an accomplice involved. Opinion: No one kisses like these two."

Also, EW promises that sometime this evening, "you’ll understand just how well Chuck’s therapy has been working. And yes, the answer has to do with Blair."

We can't wait to read your theories on that. One person not involved in the Sleep No More action? Dan, who will be "at home, hiding in embarrassment!"

Share your comments on these Gossip Girl teasers below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.